Oval air filter



FIG. 1 is a top, front, left side perspective view of the oval air filter of the present invention;

FIG. 2 is a front elevation view, the rear elevation view being a mirror image;

FIG. 3 is a left side elevation view, the right side elevation view being a mirror image;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view; and,

FIG. 6 is a bottom, rear, right side perspective view. 

CLAIM The ornamental design for an oval air filter, as shown and described. 